From 293e3306b3eb17a60e02f5bdd6f78495966f0e97 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sun, 19 Apr 2026 11:18:58 +0000
Subject: [PATCH] facetimehd: patch out wait_prepare/wait_finish for Linux 7.0

struct vb2_ops dropped wait_prepare and wait_finish in Linux 6.8.
Add a nixpkgs overlay to sed them out of fthd_v4l2.c at build time.

https://claude.ai/code/session_01XEMg2HskwRaQW3nrCd1q2z
---
 hosts/hardware/FredOS-Macbook.nix | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hosts/hardware/FredOS-Macbook.nix b/hosts/hardware/FredOS-Macbook.nix
index 7b15780..4123d54 100644
--- a/hosts/hardware/FredOS-Macbook.nix
+++ b/hosts/hardware/FredOS-Macbook.nix
@@ -34,6 +34,20 @@
   hardware.enableRedistributableFirmware = true;
   hardware.facetimehd.enable = true;
 
+  # wait_prepare/wait_finish were removed from struct vb2_ops in Linux 6.8
+  nixpkgs.overlays = [
+    (final: prev: {
+      linuxPackagesFor = kernel: (prev.linuxPackagesFor kernel).extend (lpFinal: lpPrev: {
+        facetimehd = lpPrev.facetimehd.overrideAttrs (old: {
+          postPatch = (old.postPatch or "") + ''
+            sed -i '/\.wait_prepare[[:space:]]*=.*vb2_ops_wait_prepare/d' fthd_v4l2.c
+            sed -i '/\.wait_finish[[:space:]]*=.*vb2_ops_wait_finish/d' fthd_v4l2.c
+          '';
+        });
+      });
+    })
+  ];
+
   nixpkgs.config.allowInsecurePredicate = pkg:
     (lib.hasPrefix "broadcom-sta" (lib.getName pkg));